Stunning footage shows daredevil free-diver Guillaume Néry plummeting to the depths of the world's deepest swimming pool.The astonishing video sees the 29-year-old plunging, without any breathing equipment whatsoever, a staggering 33metres to the bottom of the NEMO 33.The venue, in central Brussels, Belgium, contains 2.5million litres of non-chlorinated spring water and is usually reserved for scuba drivers to train in.With its simulated underwater caves, and constant toasty temperatures, it provides the perfect place for budding divers to gain their qualifications.For French-born Néry the dive would have been a welcome change from his usual escapades in harbours across the world.

Astonishing: The video sees the 29-year-old plunging, without any breathing equipment whatsoever, a staggering 33metres to the bottom of the NEMO 33

What goes down: The venue, in central Brussels, Belgium, contains 2.5million litres of non-chlorinated spring water and is usually reserved for scuba drivers to train in

Bottom of the pool: Slowly, the video shows Néry drifting towards the bottom of the unique swimming pool

The constant-weight free-diving specialist broke the world record in 2002 by descending 87metres in the Villefranche-sur-Mer harbour, in Alpes-Maritimes, France.And in 2004, he plunged 96metres in Saint-Leu, la Réunion, before battering the record again in 2006 with a 109metre dive in Nice, France.His feat has subsequently been beaten by two other divers, with Herbert Nitsch currently holding the title with 124metres.